Wide-area underwater coal rock pressure-bearing micro-blasting grouting and water blocking method

Abstract

The invention discloses a wide-area underwater coal rock pressure-bearing micro-blasting grouting and water blocking method. According to the wide-area underwater coal rock pressure-bearing micro-blasting grouting and water blocking method, a plurality of groups of drill holes are formed in coal rocks, and the deep-hole pressure-bearing micro-blasting technology is applied, so that on the one hand, the pressure relief and crack increasing space inside the coal rocks can be effective enlarged, and on the other hand, the efficient and uniform transmission characteristics of solid-liquid coupling explosion propagation mediums on the loaded circumference inside the holes can be given full play of, the violent dynamic loading effects of dynamite explosion can be reduced, the pressure relief and crack increasing range of the coal rock can be enlarged, large-space and all-around penetration of main and auxiliary water conduction fractures inside coal can be fully achieved, and a large-range fracture borehole structure can be formed; subsequent high-pressure grouting and blocking operations can facilitate comprehensive blocking of the main and auxiliary water conduction fractures inside the coal rocks to form a wide-area grouting curtain and to block surrounding rock water conduction fracture channels at a large area, so that significant water blocking effects can be achieved, and static rock breaking crack increasing under the dynamic loading effects of in-hole dynamite explosion and comprehensive blocking of surrounding rock wide-area water conduction fractures can be achieved.

Description

technical field [0001] The invention relates to a wide-area underwater coal-rock deep-hole pressurized micro-explosion grouting water plugging technology, which can be used for increasing permeability and cracking of coal and rock under the influence of wide-area surface water, pressurized water, underground underground rivers and fissure water , grouting, water blocking, pressure relief, anti-scouring and other fields to ensure efficient production and safe excavation of coal mines and tunnel projects in rich water mining areas. Background technique [0002] my country is rich in water resources, and surface water, underground water, underground rivers and confined water are widely distributed. In the normal mining and excavation process of coal mines and tunnel projects, they are often affected by water damage in varying degrees. For example, during the mining and excavation of shallow coal seams and tunnels, affected by mining disturbances and overlying rock fractures, c...

AI Technical Summary

Problems solved by technology

However, under the conditions of wide-area water source occurrence, it is neither realistic nor economical to take conventional water pumping measures, and is limited by the accuracy of water source detection technology. On the basis of strengthening water source auxiliary detection technology, it is often necessary to supplement Drilling a large number of water exploration holes to strengthen prevention has significantly increased the amount of drilling work and cost of drilling. In addition, there is still a certain degree of blindness in determining the parameters such as the location, direction, and depth of water exploration and water discharge holes. The water discharge holes are set in water-free or poor water areas, which cannot communicate with the dominant water cracks in the surrounding rock in time, which may easily cause huge engineering and economic losses

At the same time, based on the influence of coal mining and pressure relief, in view of the development of water-conducting cracks in the surrounding rock near the stope and the roadway, in engineering practice, the measures of grouting in the hole are adopted to completely seal the water-conducting cracks in the surrounding rock. Cracks are used to prevent the hidden danger of water inrush in water-rich coal rocks. However, due to the blindness of drilling holes for water blocking, it often results in that the drilling of surrounding rocks cannot accurately communicate with the main water-conducting channels.

When the borehole is drilled in an anhydrous, water-poor or closed fissure area, it will cause the borehole grouting to block water meaninglessly, or even if the borehole is drilled in the secondary water-conducting fissure of the surrounding rock, and effectively seal off some Secondary water-conducting fissure channels, but because the penetration of the primary and secondary water-conducting fissures in the surrounding rock is not large, the grouting plugging of the local secondary fissures in the borehole cannot effectively block the dominant water channel in the surrounding rock. Under the continuous action of internal confined water, the dominant water fissures will re-connect with other secondary water-conducting fissures outside the plugging range of the grouting hole, thereby realizing the reconstruction and diversion of the water-guiding fissure channels in the surrounding rock, which also leads to the drilling and injection of surrounding rocks. Slurry water blocking effect is not good

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